Their strengths and weaknesses should be dicated by the story a film/TV series/book is intending to tell.
What? I think there's room for all sorts, even if all sorts interest me to varying degrees (I am usually most partial to monstrous Nosferatu vampires). Superpowered vampires, weak vampires, whatever - just as Let The Right One In
and Shadows of a Vampire
are fundamentally different films, so too do their vampires have precious little in common.
It's worth noting, though, that some things we consider classically vampirish, well, aren't - Bram Stoker's Dracula was well able to travel about in daylight, it's just that he got his awesome vampire powers when the sun went down.
It was the Murnau film which gave us vampires which actually burned up in the sunlight and were corpses by day.
As far as emo vampires go, well, I like ghoulishly inhuman ones but it's also possible to get some drama and humanity out of a vampire. One turns back to Shadows of a Vampire
, which is far from a sympathetic portrayal of a vampire but Max Schreck does have his more poignant moments, what with Tichonius
and such. Being an aged, lonely immortal sucks, eh? (The aforesaid Swedish film? Also rather dramatic and human and personal with some sex element regarding its vampires.)